remove video-nvidia and install video-nvidia-470xx, it should do the trick (what you should have done on Unstable branch initially).
sudo mhwd -r pci video-nvidia
sudo mhwd -i pci video-nvidia-470xx
but still you have a messed up mhwd database mixed up, it may catch up later with system updates.
mhwd-nvidia 470.82.00-1
mhwd-nvidia-470xx 470.86-2
Maybe reinstalling mhwd-database can fix it?